1983—1992年中国陆地植被NDVI演变特征的变化矢量分析  

The Change of NDVI Time Series Based on Change Vector Analysis in China, 1983-1992

作　　者：陈云浩[1] 李晓兵[1] 陈晋[1] 史培军[1] 

机构地区：[1]北京师范大学环境演变与自然灾害教育部重点实验室

出　　处：《遥感学报》2002年第1期12-18,T001,共8页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 186 0 4);国家自然科学基金项目 ( 30 0 0 0 0 2 7)

摘　　要：以NDVI时序资料为基本数据源 ,综合应用变化矢量分析和主成分分析方法对 1983年至 1992年中国陆地植被NDVI的变化强度、变化类型及空间结构变化特征进行了分析。研究结果表明在此期间中国陆地植被NDVI变化有以下特点 :(1)十年间NDVI变化东西分异明显 ,东部变化幅度远大于西部。NDVI变化整体表现为稳中略增 ,增加区主要分布在台湾、福建、四川、河南等地 ;减少区主要分布在云南省和新疆北部等地。 (2 )空间结构信息表现了景观异质性 ,其变化主要发生在南方 ,反映了植被的生长和衰老过程及地形 (山脉走向 )变化。Change vector analysis and principal components analysis in NDVI time trajectories space are powerful tools to analyse the land cover change. The length of the change vector indicates the magnitude of the change, while its direction indicates the nature of the change. This change detection method is applied to two remotely sensed indicators of land surface conditions, i.e. NDVI and spatial structure, with aims to improving the capability to detect and categorize land cover change. The magnitude and type of changes and the changes in spatial structure indicator in China from 1983 to 1992 are calculated using the above mentioned analysis methods. Through the research, the main conclusions are drawn as follows:\;1) The change vector magnitude of NDVI is different apparently between East and West China. Larger changes of NDVI lie to the Southeast coastal areas, Taiwan and Sichuan, Yunnan province (monsoon area of Southeast and Southwest China). The changes in Northwest area and Qinghai Xizang Plateau are little. It can conclude that the monsoon climate and the human activity impact apparently on the land cover dynamic of East area (especially the different kinds of crops).\;2) NDVI of land cover changes is derived from many factors (climate, hydrology, landform, soil, land use etc.). Although the basic tendency of the climate in North China is that the temperature becomes increasing and precipitation get decreasing (drying), no obvious changes are presented in large scale in this region. Landform types and vegetation types in North China are the key factors for NDVI changes.\;3) The spatial structure indicator is able to detect changes in the seasonal ecosystem dynamic for spatially heterogeneous landscapes. Changes of spatial structure indicators of NDVI mainly locate in South China, reflecting the high heterogeneity vegetation during the growth and decay processes. The areas composed of Tianshan Mountains, Changbai Mountains, and Xiaoxinganling Mountains reflect the impact of landfo

关 键 词：植被 土地覆盖 NDVI 变化矢量分析 空间结构信息 演变特征 遥感 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]